public void TestGetNumberOfDeinterlaceModes()
{
int hr = 0;
int numModes = 0;
videoDesc = GetVideoDesc7();
hr = deinterlaceControl.GetNumberOfDeinterlaceModes(ref videoDesc, ref numModes, null);
DsError.ThrowExceptionForHR(hr);
deinterlaceModes = new Guid[numModes];
hr = deinterlaceControl.GetNumberOfDeinterlaceModes(ref videoDesc, ref numModes, deinterlaceModes);
DsError.ThrowExceptionForHR(hr);
Debug.Assert(hr == 0, "IVMRDeinterlaceControl.GetNumberOfDeinterlaceModes");
}
// this method is an implementation of the procedure describe in this page :
// http://msdn.microsoft.com/library/en-us/directshow/htm/settingdeinterlacepreferences.asp?frame=true
private VMRVideoDesc GetVideoDesc7()
{
int hr = 0;
AMMediaType mediaType = new AMMediaType();
VMRVideoDesc vDesc = new VMRVideoDesc();
vDesc.dwSize = Marshal.SizeOf(typeof(VMRVideoDesc));
IPin pinIn = DsFindPin.ByDirection(vmr, PinDirection.Input, 0);
hr = pinIn.ConnectionMediaType(mediaType);
DsError.ThrowExceptionForHR(hr);
Marshal.ReleaseComObject(pinIn);
if (mediaType.formatType == FormatType.VideoInfo2)
{
VideoInfoHeader2 videoHeader = (VideoInfoHeader2)Marshal.PtrToStructure(mediaType.formatPtr, typeof(VideoInfoHeader2));
if ((videoHeader.InterlaceFlags & AMInterlace.IsInterlaced) != 0)
{
vDesc.dwSampleWidth = videoHeader.BmiHeader.Width;
vDesc.dwSampleHeight = videoHeader.BmiHeader.Height;
vDesc.SingleFieldPerSample = ((videoHeader.InterlaceFlags & AMInterlace.OneFieldPerSample) != 0);
vDesc.dwFourCC = videoHeader.BmiHeader.Compression;
switch (videoHeader.AvgTimePerFrame)
{
case 166833:
{
vDesc.InputSampleFreq.dwNumerator = 60000;
vDesc.InputSampleFreq.dwDenominator = 1001;
break;
}
case 333667:
{
vDesc.InputSampleFreq.dwNumerator = 30000;
vDesc.InputSampleFreq.dwDenominator = 1001;
break;
}
case 333666: // this value is not define in the paper but is returned by testme.iso
{
vDesc.InputSampleFreq.dwNumerator = 30000;
vDesc.InputSampleFreq.dwDenominator = 1001;
break;
}
case 417188:
{
vDesc.InputSampleFreq.dwNumerator = 24000;
vDesc.InputSampleFreq.dwDenominator = 1001;
break;
}
case 200000:
{
vDesc.InputSampleFreq.dwNumerator = 50;
vDesc.InputSampleFreq.dwDenominator = 1;
break;
}
case 400000:
{
vDesc.InputSampleFreq.dwNumerator = 25;
vDesc.InputSampleFreq.dwDenominator = 1;
break;
}
case 416667:
{
vDesc.InputSampleFreq.dwNumerator = 24;
vDesc.InputSampleFreq.dwDenominator = 1;
break;
}
default:
{
throw new ApplicationException("Unknown AvgTimePerFrame : " + videoHeader.AvgTimePerFrame);
}
}
// Video is interleaved
vDesc.OutputFrameFreq.dwNumerator = vDesc.InputSampleFreq.dwNumerator * 2;
vDesc.OutputFrameFreq.dwDenominator = vDesc.InputSampleFreq.dwDenominator;
}
else
{
throw new ApplicationException("Only interlaced formats");
}
}
else
{
throw new ApplicationException("Only VIDEOINFOHEADER2 formats can be interlaced");
}
DsUtils.FreeAMMediaType(mediaType);
return(vDesc);
}